Honeywell UDC2800 Product Manual page 36

Table 3-2: Limit Relay Contact Information
Limit Control
Unit
Relay
Power
Wiring
Off N.O.
N.C.
On N.O.
N.C.
Alarm Relays
Table 3-3: Alarm Relay Contact Information
Unit Alarm Relay
Power Wiring
Off N.O.
N.C.
On N.O.
N.C.
Variable NOT in Limit
State
Relay
Contact
Open
Closed
Closed
Open
ATTENTION: Alarm relays are designed to operate in a failsafe
mode (that is, de-energized during alarm sate). This results in
alarm actuation when power is OFF or when initially applied,
until the unit completes self diagnostics. If power is lost to the
unit, the alarms will de-energize and thus the alarm contacts
will close.
Variable NOT in Alarm
State
Relay
Contact
Open
Closed
Closed
Open
Variable in Limit State
Relay
Indicators
Contact
Off Open
Closed
Off Open
Closed
Variable in Alarm State
Relay
Indicators
Contact
Off Open
Closed
Off Open
Closed
Chapter 3 - Installation
Indicators
Off
On
Indicators
Off
On
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